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(No Model.)

B. F. KRAMER.

ROGK BRBAKER. No. 278,801. L Patented June 5,1883.

WITNESSES //v VENTOR.

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damzzwd/ N. PETERS. Paolo-Lithographer. Washington. 0,6.

UNITED STATES PATENT OFFICE.

BERTRAM F. KRAMER, OF CHARLESTON, SOUTH CAROLINA.

ROCK-BREAKER.

SPECIFICATION formingpart of Letters Patent No. 278,801, dated June 5, 1883.

Application filed January 26, 1883. (No model.)

To all whom it may concern Be it known that I, BERTRAM FREDRIOK KRAMER, of Charleston, in the county of Charleston and State of South Carolina, have invented certain new and useful Improvements derrick, of a chiselbar, and means for allow.

ing said bar to fall by its own weight for insertion into the rock, and for tripping said bar to dislodge the rock.

The drawing represents aportion of alighter having my improvement applied thereto.

A represents the lighter, provided with the derrick-beam a, which latter is provided at its upper end with a pulley, a, and near its lower end with a pulley, a The lighter A is also provided with a downwardly inclined .boom, B, adapted to project into the water,

as illustrated in the drawing.

0 represents the breaker or chisel-bar, provided at its upper end with a link, 0, to which are secured, respectively, the ropes D and E. The rope D passes over the pulley a of the beam a to any suitable drum or hoisting device on the lighter A. The rope E passes around a pulley b, supported at the end of the boom B, and thence over the pulley a of the beam 0 to any suitable operating-drum on the lighter. The beam to and boom B are suitably braced together and to the lighter by braces F.

The operation of the device as thus constructed is as follows: The breaker or chiselbar G is controlled by means of the rope D, and is hoisted by a steam-engine or other to drop of its own weight to penetrate the rock or other hard substance. After the baris thus embedded it is tripped or thrown from its vertical position by means of the rope E, as shownin dotted lines in the drawing, thus forcing up the rock or other substance behind the point of the chisel-bar. The bar 0, I preferably. construct of steel, or iron with a steel point. i

shown and described for operating the'eliisel bar,--nor to the application of my improvement river-beds, as the improvement may be applied to many purposes on land.

Ta ent, is-

The combination, with a lighter provided with a derrick and a downwardly-projecting inclined boom, of a breaker or chisel-bar suspended from said derrick, and adapted to fall by its own weight for insertion into a bed of rock or other hard substance, and a rope passsaid bar, substantially as set forth;

In testimony whereof I have signed this speci- IIGSSGS.

BERTRAM FREDRICK KRAMER.

Witnesses S. G. NOTTINGHAM,

GEORGE 0001:.

means carried upon the lighter, and allowed to the breaking up i of the hard substances of' I do not limit myself to the appliances herein ing around a pulley of said boom.for tripping fication in the presence of two subscribing wit- Havingfully described myinv'entiomwhatlclaim as new, and desire to secure by Letters 

